The UN secretary general promised Haitians on Sunday that the world has not forgotten the quake-torn nation as it suffers from a shortage of shelter and growing violence in teeming camps for the homeless.

Security issues and the risk of flooding and disease in the squalid tent cities are pressing concerns for governments and international aid groups struggling to help hundreds of thousands of victims of the Jan. 12 disaster.

The quake killed an estimated 230,000 people and left 1.3 million homeless.

Making his second visit to Haiti since the quake, Ban Ki-moon met President René Préval and discussed plans for a UN donors conference in New York on March 31 to fund Haiti's reconstruction.

Ban said his message to Haiti's government and people is that "even if time passes, the world has not forgotten. The world is always at their side."

Haiti needs money for schools, infrastructure, roads, ports and electricity, Ban said at a news conference.

And "for the foreseeable future, the government will need international assistance simply to cover its payroll," he said.

A government statement said the tax department expects to collect only one-third of its expected annual take of $330 million US. Duties on imports are the government's main source of income.

UN humanitarian chief John Holmes said last week that the United Nations is struggling to raise the $1.44 billion needed to help earthquake victims this year. Ban said only 49 per cent has been raised.

Préval raised concerns that Haiti's farmers would be hurt by continuing imports of food aid. Already, rice farmers have told The Associated Press they cannot sell their harvest because of rice handouts.

"It was absolutely necessary that international aid arrive" after the earthquake, Préval said, but "we are now in a new reality."

Visiting tent cities

Ban later toured a makeshift camp where more than 40,000 people are living under a tapestry of blue, orange and white tarps and tents sprawled across a valley golf course — emblematic of the mixed results of a $2.2-billion international aid effort.

Behind the tents is a country club that became the base of the U.S. Army's 82nd Airborne Division in the days after the disaster. Only a few soldiers are left, but Ban said the withdrawal of U.S. and Canadian troops "will not compromise the mission."

He said Haitian police and UN peacekeepers who have been on a stabilization mission in the country since 2004 are doing "an excellent job" providing security.

But with no electricity or security, the camps are growing increasingly dangerous at night, particularly for women and girls.

Aid workers said a seven-year-old girl raped in the camp was being treated Sunday at its tent hospital.

"We will make every effort to ensure that IDP camps remain safe and secure, most especially for women and children," Ban said, referring to "internally displaced people."

Ban has also become concerned by reports of increasing gang activity, spokesman Yves Sorokobi said. More than 5,000 prisoners fled jails that collapsed or were damaged in the temblor, and only about 200 have been captured. Two European women with the Doctors Without Borders aid group were kidnapped last week and held for five days. It was not clear if a ransom was paid.

Thousands of people in the camp came down from their broken homes in the hills above the capital to be near food and water distributions overseen by the U.S. soldiers. Those distributions, like those run by the UN World Food Program and others, were largely a success — though many were marred by small-scale violence and corruption by local officials.

The camp has been a hub of activity by humanitarian groups, with schools, medical clinics and social programs setting up under canvas tents. But the valley is at major risk for floods and landslides when the rainy season starts in earnest next week.

Sixty per cent of Haiti's quake homeless have received plastic sheets or tents to protect them from deluges, but Ban acknowledged it wasn't enough.